msm: kgsl: Generate TCS votes to send to the GMU

With the demise of msm_bus_scale we lost the API to generate TCS
commands so we need to do it ourselves.

Change-Id: Ic0dedbadad9bead0508febcb942e5bb1bd6cb465
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>